3 ## Copyright (C) 2004 NABEYA Kenichi (aka nanami@2ch)
4 ## Copyright (C) 2007-2012 Daigo Moriwaki (daigo at debian dot org)
6 ## This program is free software; you can redistribute it and/or modify
7 ## it under the terms of the GNU General Public License as published by
8 ## the Free Software Foundation; either version 2 of the License, or
9 ## (at your option) any later version.
11 ## This program is distributed in the hope that it will be useful,
12 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 ## GNU General Public License for more details.
16 ## You should have received a copy of the GNU General Public License
17 ## along with this program; if not, write to the Free Software
18 ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 require 'shogi_server/move'
22 module ShogiServer # for a namespace
24 class WrongMoves < ArgumentError; end
28 # Initial board setup.
29 # The string ends with '+', not a line break.
31 INITIAL_HIRATE_POSITION = (<<-EOF).chomp
32 P1-KY-KE-GI-KI-OU-KI-GI-KE-KY
33 P2 * -HI * * * * * -KA *
34 P3-FU-FU-FU-FU-FU-FU-FU-FU-FU
38 P7+FU+FU+FU+FU+FU+FU+FU+FU+FU
39 P8 * +KA * * * * * +HI *
40 P9+KY+KE+GI+KI+OU+KI+GI+KE+KY
44 # Split a moves line into an array of a move string.
45 # If it fails to parse the moves, it raises WrongMoves.
46 # @param moves a moves line. Ex. "+776FU-3334FU" or
47 # moves with times. Ex "+776FU,T2-3334FU,T5"
48 # @return an array of a move string. Ex. ["+7776FU", "-3334FU"] or
49 # an array of arrays. Ex. [["+7776FU","T2"], ["-3334FU", "T5"]]
51 def Board.split_moves(moves)
57 if moves[i,1] == "+" ||
60 if i == moves.size - 1
66 raise WrongMoves, a[0]
68 if a.size == 1 # "+7776FU"
71 unless /^T\d+/ =~ a[1]
72 raise WrongMoves, a[1]
87 def initialize(move_count=0)
88 @sente_hands = Array::new
89 @gote_hands = Array::new
90 @history = Hash::new(0)
91 @sente_history = Hash::new(0)
92 @gote_history = Hash::new(0)
93 @array = [[], [], [], [], [], [], [], [], [], []]
94 @move_count = move_count
95 @teban = nil # black => true, white => false
97 @ous = [nil, nil] # keep OU pieces of Sente and Gote
99 attr_accessor :array, :sente_hands, :gote_hands, :history, :sente_history, :gote_history, :teban
100 attr_reader :move_count
102 # Initial moves for a Buoy game. If it is an empty array, the game is
103 # normal with the initial setting; otherwise, the game is started after the
105 attr_reader :initial_moves
107 # See if self equals rhs, including a logical board position (i.e.
108 # not see object IDs) and sennichite stuff.
111 return @teban == rhs.teban &&
112 @move_count == rhs.move_count &&
114 @history == rhs.history &&
115 @sente_history == rhs.sente_history &&
116 @gote_history == rhs.gote_history &&
117 @initial_moves == rhs.initial_moves
121 return Marshal.load(Marshal.dump(self))
125 PieceKY::new(self, 1, 1, false)
126 PieceKE::new(self, 2, 1, false)
127 PieceGI::new(self, 3, 1, false)
128 PieceKI::new(self, 4, 1, false)
129 PieceOU::new(self, 5, 1, false)
130 PieceKI::new(self, 6, 1, false)
131 PieceGI::new(self, 7, 1, false)
132 PieceKE::new(self, 8, 1, false)
133 PieceKY::new(self, 9, 1, false)
134 PieceKA::new(self, 2, 2, false)
135 PieceHI::new(self, 8, 2, false)
137 PieceFU::new(self, i, 3, false)
140 PieceKY::new(self, 1, 9, true)
141 PieceKE::new(self, 2, 9, true)
142 PieceGI::new(self, 3, 9, true)
143 PieceKI::new(self, 4, 9, true)
144 PieceOU::new(self, 5, 9, true)
145 PieceKI::new(self, 6, 9, true)
146 PieceGI::new(self, 7, 9, true)
147 PieceKE::new(self, 8, 9, true)
148 PieceKY::new(self, 9, 9, true)
149 PieceKA::new(self, 8, 8, true)
150 PieceHI::new(self, 2, 8, true)
152 PieceFU::new(self, i, 7, true)
158 # Piece#new will call back this method.
168 # Set up a board with the strs.
169 # Failing to parse the moves raises an StandardError.
170 # @param strs a board text
172 def set_from_str(strs)
173 strs.each_line do |str|
176 str.sub!(/^P(.)/, '')
179 while (str.length > 2)
180 str.sub!(/^(...?)/, '')
182 if (one =~ /^([\+\-])(..)/)
190 if ((x < 1) || (9 < x) || (y < 1) || (9 < y))
191 raise "bad position #{x} #{y}"
195 PieceFU::new(self, x, y, sente)
197 PieceKY::new(self, x, y, sente)
199 PieceKE::new(self, x, y, sente)
201 PieceGI::new(self, x, y, sente)
203 PieceKI::new(self, x, y, sente)
205 PieceOU::new(self, x, y, sente)
207 PieceKA::new(self, x, y, sente)
209 PieceHI::new(self, x, y, sente)
211 PieceFU::new(self, x, y, sente, true)
213 PieceKY::new(self, x, y, sente, true)
215 PieceKE::new(self, x, y, sente, true)
217 PieceGI::new(self, x, y, sente, true)
219 PieceKA::new(self, x, y, sente, true)
221 PieceHI::new(self, x, y, sente, true)
223 raise "unkown piece #{name}"
236 while (str.length > 3)
237 str.sub!(/^..(..)/, '')
241 PieceFU::new(self, 0, 0, sente)
243 PieceKY::new(self, 0, 0, sente)
245 PieceKE::new(self, 0, 0, sente)
247 PieceGI::new(self, 0, 0, sente)
249 PieceKI::new(self, 0, 0, sente)
251 PieceKA::new(self, 0, 0, sente)
253 PieceHI::new(self, 0, 0, sente)
255 raise "unkown piece #{name}"
263 raise "bad line: #{str}"
268 # Set up a board starting with a position after the moves.
269 # Failing to parse the moves raises an ArgumentError.
270 # @param moves an array of moves. ex. ["+7776FU", "-3334FU"] or
271 # an array of arrays. ex. [["+7776FU","T2"], ["-3334FU","T5"]]
273 def set_from_moves(moves)
275 return :normal if moves.empty?
281 rt = handle_one_move(move[0], @teban)
283 rt = handle_one_move(move, @teban)
285 raise ArgumentError, "bad moves: #{moves}" unless rt == :normal
287 @initial_moves = moves.dup
290 def have_piece?(hands, name)
291 piece = hands.find { |i|
297 # :illegal and :outori do not change this instance (self).
300 x0, x1, y0, y1, name, sente = move.x0, move.x1, move.y0, move.y1, move.name, move.sente
308 piece = have_piece?(hands, name)
309 return :illegal if (piece == nil || ! piece.move_to?(x1, y1, name))
310 piece.move_to(x1, y1)
312 if (@array[x0][y0] == nil || !@array[x0][y0].move_to?(x1, y1, name))
315 if (@array[x1][y1] && @array[x1][y1].name == "OU")
319 # Change the state of this instance (self)
320 if (@array[x0][y0].name != name && !@array[x0][y0].promoted)
321 # the piece is promoting
322 @array[x0][y0].promoted = true
323 move.promotion = true
325 if (@array[x1][y1]) # capture
326 move.set_captured_piece(@array[x1][y1])
327 @array[x1][y1].sente = @array[x0][y0].sente
328 @array[x1][y1].move_to(0, 0)
329 hands.sort! {|a, b| # TODO refactor. Move to Piece class
333 @array[x0][y0].move_to(x1, y1)
336 @teban = @teban ? false : true
340 # Get back the previous move, which moved a name piece from [x0,y0] to
341 # [x1, y1] with or without promotion. If the move captured
342 # a piece, it is captured_piece, which is now in hand. The captured_piece
343 # was promoted or unpromoted.
352 piece = @array[move.x1][move.y1]
356 piece.move_to(move.x0, move.y0)
357 piece.promoted = false if piece.promoted && move.promotion
358 if move.captured_piece
359 move.captured_piece.move_to(move.x1, move.y1)
360 move.captured_piece.sente = move.sente ? false : true
361 move.captured_piece.promoted = true if move.captured_piece_promoted
366 @teban = @teban ? false : true
370 # def each_reserved_square
372 def look_for_ou(sente)
380 # See if sente is checked (i.e. loosing) or not.
381 # Note that the method name "checkmated?" is wrong. Instead, it should be
384 def checkmated?(sente)
385 ou = look_for_ou(sente)
391 (@array[x][y].sente != sente))
392 if (@array[x][y].movable_grids.include?([ou.x, ou.y]))
403 # See if sente's FU drop checkmates the opponent or not.
405 def uchifuzume?(sente)
406 rival_ou = look_for_ou(! sente) # rival's ou
407 if (sente) # rival is gote
408 if ((rival_ou.y != 9) &&
409 (@array[rival_ou.x][rival_ou.y + 1]) &&
410 (@array[rival_ou.x][rival_ou.y + 1].name == "FU") &&
411 (@array[rival_ou.x][rival_ou.y + 1].sente == sente)) # uchifu true
413 fu_y = rival_ou.y + 1
418 if ((rival_ou.y != 1) &&
419 (@array[rival_ou.x][rival_ou.y - 1]) &&
420 (@array[rival_ou.x][rival_ou.y - 1].name == "FU") &&
421 (@array[rival_ou.x][rival_ou.y - 1].sente == sente)) # uchifu true
423 fu_y = rival_ou.y - 1
429 ## case: rival_ou is moving
430 rival_ou.movable_grids.each do |(cand_x, cand_y)|
431 tmp_board = deep_copy
432 s = tmp_board.move_to(Move.new(rival_ou.x, rival_ou.y, cand_x, cand_y, "OU", ! sente))
433 raise "internal error" if (s != true)
434 if (! tmp_board.checkmated?(! sente)) # good move
439 ## case: rival is capturing fu
445 (@array[x][y].sente != sente) &&
446 @array[x][y].movable_grids.include?([fu_x, fu_y])) # capturable
449 if (@array[x][y].promoted)
450 names << @array[x][y].promoted_name
452 names << @array[x][y].name
453 if @array[x][y].promoted_name &&
454 @array[x][y].move_to?(fu_x, fu_y, @array[x][y].promoted_name)
455 names << @array[x][y].promoted_name
459 tmp_board = deep_copy
460 s = tmp_board.move_to(Move.new(x, y, fu_x, fu_y, name, ! sente))
464 tmp_board.checkmated?(! sente) # result
467 all_illegal = names.find {|a| a != :illegal}
468 raise "internal error: legal move not found" if all_illegal == nil
469 r = names.find {|a| a == false} # good move
470 return false if r == false # found good move
479 # @[sente|gote]_history has at least one item while the player is checking the other or
481 def update_sennichite(player)
484 if checkmated?(!player)
486 @sente_history["dummy"] = 1 # flag to see Sente player is checking Gote player
488 @gote_history["dummy"] = 1 # flag to see Gote player is checking Sente player
492 @sente_history.clear # no more continuous check
494 @gote_history.clear # no more continuous check
497 if @sente_history.size > 0 # possible for Sente's or Gote's turn
498 @sente_history[str] += 1
500 if @gote_history.size > 0 # possible for Sente's or Gote's turn
501 @gote_history[str] += 1
505 # Deep-copy sennichite stuff, which will later be available to restore.
507 def dup_sennichite_stuff
508 return [@history.dup, @sente_history.dup, @gote_history.dup]
511 # Restore sennihite stuff.
513 def restore_sennichite_stuff(history, sente_history, gote_history)
514 @history, @sente_history, @gote_history = history, sente_history, gote_history
517 def oute_sennichite?(player)
518 return nil unless sennichite?
522 if (@sente_history[to_s] >= 4) # sente is checking gote
523 return :oute_sennichite_sente_lose
524 elsif (@gote_history[to_s] >= 3) # sente is escaping
525 return :oute_sennichite_gote_lose
527 return nil # Not oute_sennichite, but sennichite
531 if (@gote_history[to_s] >= 4) # gote is checking sente
532 return :oute_sennichite_gote_lose
533 elsif (@sente_history[to_s] >= 3) # gote is escaping
534 return :oute_sennichite_sente_lose
536 return nil # Not oute_sennichite, but sennichite
542 if (@history[to_s] >= 4) # already 3 times
548 def good_kachi?(sente)
549 if (checkmated?(sente))
550 puts "'NG: Checkmating." if $DEBUG
554 ou = look_for_ou(sente)
555 if (sente && (ou.y >= 4))
556 puts "'NG: Black's OU does not enter yet." if $DEBUG
559 if (! sente && (ou.y <= 6))
560 puts "'NG: White's OU does not enter yet." if $DEBUG
578 (@array[x][y].sente == sente) &&
579 (@array[x][y].point > 0))
580 point = point + @array[x][y].point
586 hands.each do |piece|
587 point = point + piece.point
591 puts "'NG: Piece#[%d] is too small." % [number] if $DEBUG
596 puts "'NG: Black's point#[%d] is too small." % [point] if $DEBUG
601 puts "'NG: White's point#[%d] is too small." % [point] if $DEBUG
606 puts "'Good: Piece#[%d], Point[%d]." % [number, point] if $DEBUG
610 # sente is nil only if tests in test_board run
617 # - :oute_sennichite_sente_lose
618 # - :oute_sennichite_gote_lose
622 # - (:outori will not be returned)
624 def handle_one_move(str, sente=nil)
625 if (str =~ /^([\+\-])(\d)(\d)(\d)(\d)([A-Z]{2})/)
632 elsif (str =~ /^%KACHI/)
633 raise ArgumentError, "sente is null", caller if sente == nil
634 if (good_kachi?(sente))
639 elsif (str =~ /^%TORYO/)
645 if (((x0 == 0) || (y0 == 0)) && # source is not from hand
646 ((x0 != 0) || (y0 != 0)))
648 elsif ((x1 == 0) || (y1 == 0)) # destination is out of board
653 sente = true if sente == nil # deprecated
654 return :illegal unless sente == true # black player's move must be black
657 sente = false if sente == nil # deprecated
658 return :illegal unless sente == false # white player's move must be white
663 if ((x0 == 0) && (y0 == 0))
664 return :illegal if (! have_piece?(hands, name))
665 elsif (! @array[x0][y0])
666 return :illegal # no piece
667 elsif (@array[x0][y0].sente != sente)
668 return :illegal # this is not mine
669 elsif (@array[x0][y0].name != name)
670 return :illegal if (@array[x0][y0].promoted_name != name) # can't promote
674 if (@array[x1][y1] &&
675 (@array[x1][y1].sente == sente)) # can't capture mine
677 elsif ((x0 == 0) && (y0 == 0) && @array[x1][y1])
678 return :illegal # can't put on existing piece
681 move = Move.new(x0, y0, x1, y1, name, sente)
682 result = move_to(move)
683 if (result == :illegal)
687 if (checkmated?(sente))
689 return :oute_kaihimore
691 if ((x0 == 0) && (y0 == 0) && (name == "FU") && uchifuzume?(sente))
696 sennichite_stuff = dup_sennichite_stuff
697 update_sennichite(sente)
698 os_result = oute_sennichite?(sente)
699 if os_result # :oute_sennichite_sente_lose or :oute_sennichite_gote_lose
701 restore_sennichite_stuff(*sennichite_stuff)
706 restore_sennichite_stuff(*sennichite_stuff)
713 # Return a CSA-styled string notation of the current position.
719 a.push(sprintf("P%d", y))
731 a.push(sprintf("\n"))
734 if (! sente_hands.empty?)
736 sente_hands.each do |p|
737 a.push("00" + p.name)
741 if (! gote_hands.empty?)
743 gote_hands.each do |p|
744 a.push("00" + p.name)
748 a.push("%s\n" % [@teban ? "+" : "-"])
752 # Return a CSA-styled string notation of the initial position.
755 tmp_board = self.class.new
757 return tmp_board.to_s